attribute vec4 a_position;
attribute vec4 a_texcoord;

uniform vec2 u_InvTextureSize;

varying vec2 v_texCoord;

void main()
{
    gl_Position = CC_MVPMatrix * vec4(a_position.xy + a_position.zw * a_texcoord.zw,0.0 ,1.0);
	v_texCoord = (a_texcoord.xy + a_position.zw * a_texcoord.zw) * u_InvTextureSize;
}

#ifdef GL_ES
precision mediump float;
#endif

varying vec2 v_texCoord;
uniform sampler2D u_texture;

void main()
{
	gl_FragColor = texture2D(u_texture,v_texCoord);
}

(-0.5,-0.5, 0, 0)
(-0.5,31.5, 0, 1)
(31.5,-0.5, 1, 0)
(31.5,31.5, 1, 1)

(1.5,1.5,31,31)
(1.5,1.5,31,31)
(1.5,1.5,31,31)
(1.5,1.5,31,31)

var xOffset = -TileWorX.TILE_PIXEL_SIZE - Utilities.Remainder(this.renderArea.Left, TileWorX.TILE_PIXEL_SIZE);
var yOffset = -TileWorX.TILE_PIXEL_SIZE - Utilities.Remainder(this.renderArea.Top, TileWorX.TILE_PIXEL_SIZE);

public static Int32 Remainder(Int32 a, Int32 b)
{
	return (a % b + b) % b;
}